PPM-type phosphatase-like domain
IPR001932
Definition
Protein phosphatases remove phosphate groups from various proteins that are the key components of a number of signalling pathways in eukaryotes and prokaryotes. Protein phosphatases that dephosphorylate Ser and Thr residues are classified into the phosphoprotein (PPP) and the protein phosphatase Mg2- or Mn2-dependent (PPM) families. The core structure of PPMs is the 300-residue PPM-type phosphatase domain that catalyses the dephosphorylation of phosphoserine- and phosphothreonine-containing protein. The PPM-type phosphatase domain is found as a module in diverse structural contexts and is modulated by targeting and regulatory subunits [[cite:PMID:9003755], [cite:PMID:9869399], [cite:PMID:22115775], [cite:PMID:22668558]]. Some proteins known to contain a PPM-type phosphatase domain are listed below: Bacillus subtilis stage II sporulation protein E (SpoIIE), controls the sporulation by dephosphorylating an anti-transcription factor SpoIIAA, reversing the actions of the SpoIIAB protein kinase in a process that is governed by the ADP/ATP ratio [levdikov]. Mycobacterium tuberculosis PP2C-family Ser/Thr phosphatase (PstP). Eucaryotic PP2C, a negative regulator of protein kinase cascades that are activated as a result of stress. Yeast adenylyl cyclase, plays essential roles in regulation of cellular metabolism by catalysing the synthesis of a second messenger, cAMP PMID:24518043. Mammalian mitochondrial pyruvate dehydrogenase phosphatase 1 (PDP1). Plant kinase-associated protein phosphatase (KAPP), regulates receptor-like kinase (RLK) signalling pathways. Plant absissic acid-insenstive 1 and 2 (ABI1 and ABI2), play a key absissic acid (ABA) signal transduction. The PP2C-type phosphatase domain consists of 10 segments of β-strands and 5 segments of α-helix and comprises a pair of detached subdomains. The first is a small β-sandwich with strand β1 packed against strands β2 and β3; the second is a larger β-sandwich in which a four-stranded β-sheet packs against a three-stranded β-sheet with flanking α-helices [[cite:PMID:9003755], [cite:PMID:22115775]].
20 human proteins with this domain
Each is a reviewed human protein in the Seroatlas serome and a potential autoantibody target; this domain groups them into one antibody-relevant category. Every entry links to its own record.
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